What’s Vulnerable › Vulnerabilities

CVE-2026-104425: Zebra before 6.1.0 Batch-Verification Poisoning DoS via Unattributed Pushed Transactions

• Severity: medium (CVSS 5.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-02 · updated 2026-10-02
• Weakness: CWE-405

Description

ZcashFoundation Zebra before 6.1.0 contains a resource exhaustion vulnerability that allows unauthenticated peers to degrade block processing by pushing transactions with invalid Orchard proofs without being misbehavior-scored. Attackers can repeatedly push invalid proofs into the shared halo2 batch verifier, forcing honest block proofs onto the slow individual-verification path and slowing block processing roughly sevenfold.

Affected products

• ZcashFoundation zebra: before 6.1.0 — fixed in 6.1.0

How to fix

Upgrade to a fixed version: ZcashFoundation zebra 6.1.0. Check the vendor advisory for mitigations.

References

• https://github.com/ZcashFoundation/zebra/security/advisories/GHSA-g7c4-2w6c-cr3r
• https://www.vulncheck.com/advisories/zebra-before-6.1.0-batch-verification-poisoning-dos-via-unattributed-pushed-transactions

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